Make use of js-sdk roomNameGenerator to handle i18n for generated room names

src/MatrixClientPeg.ts

@@ -17,7 +17,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import { ICreateClientOpts, PendingEventOrdering } from 'matrix-js-sdk/src/matrix';
+import { ICreateClientOpts, PendingEventOrdering, RoomNameState, RoomNameType } from 'matrix-js-sdk/src/matrix';
 import { IStartClientOpts, MatrixClient } from 'matrix-js-sdk/src/client';
 import { MemoryStore } from 'matrix-js-sdk/src/store/memory';
 import * as utils from 'matrix-js-sdk/src/utils';
@@ -37,6 +37,7 @@ import IdentityAuthClient from './IdentityAuthClient';
 import { crossSigningCallbacks, tryToUnlockSecretStorageWithDehydrationKey } from './SecurityManager';
 import SecurityCustomisations from "./customisations/Security";
 import CryptoStoreTooNewDialog from "./components/views/dialogs/CryptoStoreTooNewDialog";
+import { _t } from "./languageHandler";
 
 export interface IMatrixClientCreds {
     homeserverUrl: string;
@@ -278,6 +279,46 @@ class MatrixClientPegClass implements IMatrixClientPeg {
         return matches[1];
     }
 
+    private memberNamesToRoomName(names: string[], count: number): string {
+        const countWithoutMe = count - 1;
+        if (!names.length) {
+            return _t("Empty room");
+        }
+        if (names.length === 1 && countWithoutMe <= 1) {
+            return names[0];
+        }
+        if (names.length === 2 && countWithoutMe <= 2) {
+            return _t("%(user1)s and %(user2)s", {
+                user1: names[0],
+                user2: names[1],
+            });
+        }
+        return _t("%(user)s and %(count)s others", {
+            user: names[0],
+            count: countWithoutMe,
+        });
+    }
+
+    private inviteeNamesToRoomName(names: string[], count: number): string {
+        const countWithoutMe = count - 1;
+        if (!names.length) {
+            return _t("Empty room");
+        }
+        if (names.length === 1 && countWithoutMe <= 1) {
+            return names[0];
+        }
+        if (names.length === 2 && countWithoutMe <= 2) {
+            return _t("Inviting %(user1)s and %(user2)s", {
+                user1: names[0],
+                user2: names[1],
+            });
+        }
+        return _t("Inviting %(user)s and %(count)s others", {
+            user: names[0],
+            count: countWithoutMe,
+        });
+    }
+
     private createClient(creds: IMatrixClientCreds): void {
         const opts: ICreateClientOpts = {
             baseUrl: creds.homeserverUrl,
@@ -300,6 +341,27 @@ class MatrixClientPegClass implements IMatrixClientPeg {
             ],
             identityServer: new IdentityAuthClient(),
             cryptoCallbacks: {},
+            roomNameGenerator: (_: string, state: RoomNameState) => {
+                switch (state.type) {
+                    case RoomNameType.Generated:
+                        switch (state.subtype) {
+                            case "Inviting":
+                                return this.inviteeNamesToRoomName(state.names, state.count);
+                            default:
+                                return this.memberNamesToRoomName(state.names, state.count);
+                        }
+                    case RoomNameType.EmptyRoom:
+                        if (state.oldName) {
+                            return _t("Empty room (was %(oldName)s)", {
+                                oldName: state.oldName,
+                            });
+                        } else {
+                            return _t("Empty room");
+                        }
+                    default:
+                        return null;
+                }
+            },
         };
 
         // These are always installed regardless of the labs flag so that

src/i18n/strings/en_EN.json

@@ -97,6 +97,14 @@
     "Try again": "Try again",
     "Your homeserver was unreachable and was not able to log you in. Please try again. If this continues, please contact your homeserver administrator.": "Your homeserver was unreachable and was not able to log you in. Please try again. If this continues, please contact your homeserver administrator.",
     "Your homeserver rejected your log in attempt. This could be due to things just taking too long. Please try again. If this continues, please contact your homeserver administrator.": "Your homeserver rejected your log in attempt. This could be due to things just taking too long. Please try again. If this continues, please contact your homeserver administrator.",
+    "Empty room": "Empty room",
+    "%(user1)s and %(user2)s": "%(user1)s and %(user2)s",
+    "%(user)s and %(count)s others|other": "%(user)s and %(count)s others",
+    "%(user)s and %(count)s others|one": "%(user)s and 1 other",
+    "Inviting %(user1)s and %(user2)s": "Inviting %(user1)s and %(user2)s",
+    "Inviting %(user)s and %(count)s others|other": "Inviting %(user)s and %(count)s others",
+    "Inviting %(user)s and %(count)s others|one": "Inviting %(user)s and 1 other",
+    "Empty room (was %(oldName)s)": "Empty room (was %(oldName)s)",
     "%(name)s is requesting verification": "%(name)s is requesting verification",
     "%(brand)s does not have permission to send you notifications - please check your browser settings": "%(brand)s does not have permission to send you notifications - please check your browser settings",
     "%(brand)s was not given permission to send notifications - please try again": "%(brand)s was not given permission to send notifications - please try again",
@@ -1869,7 +1877,6 @@
     "System Alerts": "System Alerts",
     "Historical": "Historical",
     "Suggested Rooms": "Suggested Rooms",
-    "Empty room": "Empty room",
     "Add space": "Add space",
     "You do not have permissions to add spaces to this space": "You do not have permissions to add spaces to this space",
     "Join public room": "Join public room",